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A biome is a region in a world with distinct geographic features. A World can contain mutliple Biomes.

Examples of biomes are:

  • Meadows
  • Woodland
  • Tundra
  • Desert

A Biome specifies what sub-biomes and species spawn within its area. Area where a biome spawns is hand painted.

Painting Biomes

Select Biomes tool from the toolbar and then select the Biome you want to paint with in the dropdown list. After that you can paint that Biome over the landscape.


The visualization color of each Biome can be modified in the biome asset (Debug Color property).



Sub-biomes are smaller biomes inside the hand-painted biomes. The key difference between biomes and sub-biomes is that sub-biomes have a mask/material which allows for defining their placement procedurally.

As an example, you may have a "Mountains" biome with several sub-biomes:

  • Mountain Forest
  • Mountain Woodland
  • Mountain Grassland

Sub-biomes may be shared between Biomes. Ex: "Grassland" sub-biome could be used in "Tundra" and "Moderate" biomes. where each of these sub-biomes can share or completely replace spawned species.

You usually want to place your species in sub-biomes.

Placing species in Biomes asset is usually reserved for quick tests and throwaway maps. Sub-Biomes provide control which becomes important for setups with more than a few species.


Sub-biomes may be placed procedurally (based on a number of inputs, such as hand-painted masks, textures, landscape weightmaps, etc).

Each sub-biome has a generation material mask where we define that logic.

The sub-biome with the highest value in the growth mask (in some area) will spawn over other sub-biomes.

When two sub-biomes output exactly the same growth value they spawn on top of each other (together).